Effect of Residual Stress on Fatigue Strength in Resistance Spot Weldment

저항 점 용접부의 피로강도에 미치는 잔류응력의 영향

Yang, Yeong-Su;Son, Gwang-Jae;Jo, Seong-Gyu;Hong, Seok-Gil;Kim, Seon-Gyun;Mo, Gyeong-Hwan

  • Published : 2001.11.01


Estimation of fatigue strength on the spot welded joint is very Important for strength design of spot welded steed sheet structures. In this paper, the effect of residual stress on the fatigue life of resistance spot weldment was studied. Residual stress fields of weldment were calculated by using thermo elastic plastic finite element analysis and equivalent fatigue stress considering residual stress effect was obtained. And then we predicted fatigue life, which included the effect of the residual stresses and the actual loading stresses. The calculation and experimental results were in good agreement. Therefore, the proposed calculated model can be considered to be sufficiently powerful for the prediction of fatigue life.


Residual Stress;Fatigue Strength;Resistance Spot Welding


  1. Bannantine, J. A., Comer, J. J. and Handrock, J. L., 1990, Fundamentals of Metal Fatigue Analysis, Prentice Hall, pp. 1-6
  2. Tasi, C. L., Dai, W. L., Dikinson, D. W. and Papritan, J. C., 1991, 'Analysis and Development of a Real-Time Control Methodology in Resistance Spot Welding,' Welding Journal, pp. 339-351
  3. Metals Handbook, 10th Edition, Vol. 1
  4. Fuchs, H. O. and Stephens, R. I., 1980, Metal Fatigue in Engineering, John Wiley & Sons, pp. 176-181
  5. 손일선, 배동호, 홍정균, 이범노, 2000, '잔류응력을 고려한 점용접이음재의 피로설계,' 대한기계학회논문집, 24권, 3호, pp. 743-751
  6. 이형일, 최진용, 2000, '점용접시편의 과부하해석 및 유효 J-적분에 의한 피로수명예측,' 대한기계학회논문집, 24 권, 3호, pp. 567-580
  7. 이형일, 김남호, 이태수, 2000, '점용접시편의 극한하중과 피로특성에 관한 실험적 고찰,' 대한기계학회논문집, 24권, 1호, pp. 38-51
  8. Nagpal, R. and Kyo, E. Y., 1996, A Time-Domain Fatigue Life Prediction Method for Vehicle Body Structures, 960567
  9. Song, S.-H., Choi, B. H. and Bae, J. S., 1998, 'Crack Propagation Behavior Based on the Characteristic of the Interaction Between Two Fatigue Crack,' KSME Int. J., Vol. 12, No. 2, pp. 191-198
  10. Mo, K. H., Suh, K. W. and Hong, S. G., 2000, New Approach in Vechile Durability Evaluation, Virtual Proving Ground, Seoul 2000 FISITA World Automotive Congress
  11. Steinwender, G., Gaier, C., Unger, B. and Puch, D., 1999, Fatigue Simulation During the Design Process of Vechicle Structures, ISATA 99 CONFERENCE VIENNA PAPER 99SI011
  12. Sheppard, S. D. and Stranger, M., 1992, 'Fatigue Life Estimation in Resistance Spot Welds : Initiation and Early Growth Phase,' Fatigue Fract. Engng. Master. Struct., vol. 15, no. 6, pp. 531-549
  13. Gaier, C. H., Unger, B. and Vogler, J., 1999, Theory and Applications of Femfat-A-FE-Postprocessing Tool for Fatigue Analysis, Fatigue Conference Beijing
  14. Choi, G. S., Han, K. M., and Paik, S. H., 2000, Dynamic Stress Analysis of Vechile Using Virtual Proving Ground Approach, SAE 2000 World Congress, Detroit, Michigan, March 6-9